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  #49  
Old 01-25-2014, 01:17 AM
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What you read is very true. The peak torque is a fairly flat band on a well designed turbo diesel. The economy sweet spot is the low end of the curve where torque starts to rise to the peak. My Powerstroke is most economical at 1450 to 1700 rpm. Max rpm is 3500.

Best mileage on my my GC CRD occurs at 50 mph and drops off aprox 10% at 65, 25% at 80. Wind resistance plays an exponential part in the equation.
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  #50  
Old 01-25-2014, 01:18 AM
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Re: Miles per Gallon

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Originally Posted by ExcursionDiesel View Post
You guys getting poor mileage probably have a lead foot. Although fun, your tires, brakes, economy, and motor life are all reduced. Whatever makes you happy...drive it like you stole it....its all good!
Thanks for the tips, but I disagree with the "lead foot" allegation. On my last run I had my tires filled at 40 psi (cold pressure, before departure) and the cruise control set for 77 on an interstate in the plains. RPMs rarely got above 2k. That run averaged 24 on regular diesel/22 mpg on premium (FWIW, EVIC and my fuel log app have always been in reasonably close concordance).

Around town lately I can get an instantaneous ~20 mpg reading on EVIC if I am holding the revs down to 1500 on flat surface roads, which is essentially too slow to accelerate at all (the vehicle seems to top out at around 30 mph). So, it isn't that burnout sessions are dragging down my mileage.

I am about to say "screw it" and just try to enjoy the vehicle and ignore the fact that my mileage is lower than the old V8 sedan I was driving before I got this. It's great that so many members are getting these epic results, but I wanted to document my experiences in case there are others out there wondering why their diesel can't drive from LA to Boston on one tank "like everyone else can" (haha).

Regardless, we will see what happens next summer, with better ambient temps, lower density air, lower rolling resistance in the tires, and summer blend diesel.
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  #51  
Old 01-25-2014, 01:21 AM
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Roadkill,

My apologies. There may be another reason. Are you up North by any chance? Maybe someone else can confirm but I've heard that the "Winter Diesel" blend sold in colder regions is good for a 20% or more loss in economy.
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  #52  
Old 01-25-2014, 01:35 AM
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Re: Miles per Gallon

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Originally Posted by ExcursionDiesel View Post
Roadkill,

My apologies. There may be another reason. Are you up North by any chance? Maybe someone else can confirm but I've heard that the "Winter Diesel" blend sold in colder regions is good for a 20% or more loss in economy.
No need to apologize; Occam's Razor was on your side for this one—it's good advice that people should consider first.

Yes, the diesel sold around here is winterized, and at least one of those "premium blends" was an 80/20 mix of #2/#1. Also, I'm wondering if somehow I had the bad luck to end up with two 230 mile roundtrip runs "...with headwinds both ways, each time, now get off my lawn!" (haha) Still, that's close to 1,000 miles of data.

Further, it has been all polar vortex-y lately in this region of Iowa (and apparently everywhere else, too), which is likely to be a contributing factor.

Regardless, I have just had the Jeep for about a month, so there isn't much chronological history for comparison yet.
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  #53  
Old 01-27-2014, 10:40 AM
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Re: Miles per Gallon

While I have not gotten a 30 yet I do believe that when the summer comes around that will be achieved. Oh my is 4X4. Oh and setting the cruise at 70+ is certainly going to cut down on your mileage. In my experience with the JGC and significantly more with a TDI I can really jack up my MPG if I keep it in the 60 to 65 range and honestly believe that I do better without cruise. I often have a good deal of road to myself so on some hills I lose speed rather than stomp on it to maintain speed or even accelerate. On Downhills I try to stay off the pedal as much as possible.

I think that post by ExcursionDiesel was excellent and I agree with him completely. With my TDI I was able to move my MPG from around 39 to a consistent 42 by following those tips as well as slowing down. Once I saw what a difference it made, well it became harder to fly up the highway at 70+ all the time. This truck has so much more wind resistance than the TDI and if you understand how resistance works you know that as you increase speed the amount of resistance does not simply increase proportional to your increase in speed.

Try finding a straight flat patch of highway and watch you MPG when you maintain a steady pedal at say 55 and then the same thing at 75. I am not sure that going 75 on the highway is any worse for you vehicle than 55 but I do know that you will consume more fuel. No matter what I think Diesel is way better than gas so drive the way you want and be glad you are not driving a gas engine.
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  #54  
Old 01-28-2014, 09:16 AM
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Re: Miles per Gallon

This winter is unusual - its not "its cold because its winter" cold...its dangerously cold. Temps that can damage bare skin won't do nice things to internal combustion engines either. ALL of my vehicles' mileages have plummeted. My XJ is usually a rock-solid 16mpg. Last fill? 12.6. Cummins is normally 17-19 on my short mountain commute to work. Its hovering around 14. The WK2 has me tickled - even with the bizarre cold and all the winter blend crap, I'm still around 23 commuting in the mountains. I have no doubt that number will skyrocket once the little ice age is over...but until then I still have an amazing truck with a ton of luxury features (LOVE that heated wheel!!!), giving very respectable mpg.
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Old 01-29-2014, 09:41 AM
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Re: Miles per Gallon

Filled up last night and I got 25 MPG on this last tank. Did way more city driving than usual and it was really cold. I am amazed at the impact that extreme cold has on this vehicle. I never drove it on summer fuel so the fuel has nothing to do with the the mileage I got this last tank. With temps in the teens and lower I can see on my daily commute that I am not able to get the higher numbers I got when it was in the 30 and 40's. Not sure if it is efficiency of the motor or the increase in wind resistance that is the primary culprit. The fact that fuel increased like 20 cents since my last fill up made this trip to the pumps less than pleasing.
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Old 01-29-2014, 11:02 AM
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Re: Miles per Gallon

I've had great luck with the 8.4AN and its fuel finder app. Its saved me up to .50/gal with only a couple miles' drive.
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Old 02-04-2014, 08:54 PM
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Re: Miles per Gallon

I am in Australia so youll need to covert but.


first tank averaged 7.5L/100

after 500kms, started to use the right foot and averaged 10L/100

both these were a 50/50 mix of hwy and urban driving

After my last fill up I decided to drive economically (ie the speed limit). I did 135 km on country roads (castle hill to wismans ferry and back for those familiar with sydney). Got 5.8 l/100. Wow is all i can say. that was averaging 78kmh and was quite hilly. very impressed.
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Old 02-10-2014, 11:16 AM
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Re: Miles per Gallon

I admit, I am getting annoyed with the vehicle. Not so much the 13 to 14 mpg (~16 L/100 km for our metric friends) average I am now getting in-city... I have reconciled myself to that.

What is actually annoying is when I have to step on the accelerator to cause the vehicle to continue to proceed downhill at 7 mph. I mean, seriously, why does it require 1800 rpm to keep from slowing down? Because that's what it does if I release the accelerator. No, the parking brake is not on... it's just in "D" w/ Eco on and choosing to be in 2nd gear, with normal terrain selection.

For example, I feel like I should be able to get more than 11 mpg while driving downhill on the ramps at a parking garage. I also think it is unreasonable to have the engine have to work significantly in order to accomplish something gravity would do for free.
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Old 02-10-2014, 11:45 AM
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Re: Miles per Gallon

I'm not sure its possible to get 13, 14 in this vehicle without a tow unless you have something seriously wrong. How are you calculating your mileage?
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Old 02-10-2014, 12:04 PM
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Re: Miles per Gallon

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I'm not sure its possible to get 13, 14 in this vehicle without a tow unless you have something seriously wrong. How are you calculating your mileage?
I am using the EVIC average value, periodically reset (perhaps once or twice a week). The fuel tank is large enough, and my commutes small enough (average of 15 miles per day), that I still only have to refuel relatively infrequently. I'm coming up on a refuel this week, but I doubt it will be markedly out of agreement with the EVIC data (so far that has aligned fairly closely).

Perhaps the vehicle is constantly in passive regen, or the transmission isn't getting up to operating temp, or 0 F is just too damn cold, or whatever. However, like I said, it's mostly annoying to have to apply power to go downhill at low speeds. It just seems pathetic.
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